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After switching to AC mode during defrost, by the time the indoor coil got cold enough to begin condensing, the defrost cycle would, in all probability, be terminated and the unit shifted back to heating mode.

After switching to AC mode during defrost, by the time the indoor coil got cold enough to begin condensing, the defrost cycle would, in all probability, be terminated and the unit shifted back to heating mode.

And, in the case of an upflow dual fuel system like mine it seems like even if the coil got a little wet, the heat from the furnace would evaporate any moisture off the coil right away.

That's what I have, but it's dual-fuel in an upflow configuration. The bypass take-off is above the coil and the humidifier is on the return.

I have the VisionPRO IAQ with DATS in the supply plenum, downstream from the coil. The system is set to humidify in "desert humidification" mode, so I believe the IAQ will shut off the humidifier if the supply air is too cold. But, the humdifier water panel is probably still wet for that amount of time.

Indoor RH is only 30%, but if the humidifier is on I guess RH would be higher at the coil.